I released version 0.2 of AD Book Builder. You can download it from the AD Book Builder page on this site.
Version 0.2 provides EPUB support. You can publish EPUB books with simple formatting needs, such as novels.
One user interface change in version 0.2 is the addition of a Book menu to the menu bar. The Book menu has two items: a Publish item to publish a book, and an Edit Title/Author item. The Edit Title/Author menu item opens a sheet to enter your book’s title, author, and unique identifier. If you have an ISBN number, use that as the book’s unique identifier.